[ltt-dev] problems with ust

[Sylvain Geneves]

>>
>>
>> the only error message i see now is the following :
>>
>> sh: symbol lookup error: /usr/local/lib/libustfork.so: undefined symbol:
>> ust_before_fork
>>
>> the simlink is valid and points to the librairy.
>>
>> $readelf -a /usr/local/lib/libustfork.so.0.0.0 | grep ust_before_fork
>> 00001ba4 00000607 R_386_JUMP_SLOT 00000000 ust_before_fork
>> 6: 00000000 0 NOTYPE GLOBAL DEFAULT UND ust_before_fork
>> 64: 00000000 0 NOTYPE GLOBAL DEFAULT UND ust_before_fork
>>
>>
>> it seems that the function is declared somewhere, but not defined ?
>
> Since your program does not use fork(), don't use the -f option to
> usttrace, and it should fix this problem.
>

indeed it fixes the problem, sorry to have bothered you with these 
usttrace flags problems...i should have read the manual more carefully.

but i still have problem with lttv-gui to open the trace directory 
(which looks like this : ~/.usttraces/californium-20100416090024748555759)

"Cannot open trace : maybe you should enter in the trace directory to 
select it ?"

however, there is no missing file, nor empty directory, but i can't see 
the events i'm supposed to see in lttv-gui...



when ran with usttrace (with no additionnal option), a simple program 
like this one produces empty ustd.log and app.log, and no subdir in the 
trace directory.

#include <ust/marker.h>
int main(int argc, char **argv)
{
   int v = 42;

   /* a marker: */
   trace_mark(main, myevent, "firstarg %d ", v);

   /* a marker without arguments: */
   trace_mark(main, myotherevent, MARK_NOARGS);

   return 0;
}

Thanks
Sylvain


> Thanks for these detailed reports, it's giving me ideas about how to
> make error messages more comprehensible.
>
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